William d



(NO Model.)

W. D. HERSGHEL;

TRAMMEL.

Patented Feb. 13.1883.

INVENTOR:

WITNESSES:-

& PETERS. mumm -1 m. 'wumn m. 0,0.

UNITED STATES WILLIAM D. HERSOHEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNQR TO PATENT OrFIcE.

MARTHA A. HUMPHREYS, OF SAME PLACE.

TRAMMEL.

' SPECIFICATION forming part of Letters Patent No. 272,047, dated February 13,1883.

Application filed May 16, 1882. (No model.) I A To all whom it may concern:

Be it known that I, WILLIAM D. HERSGHEL, a citizen of theUnited States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Trammels, which improvement is fully set forth in the following specification and accompanying drawings,"in Which- Figures 1 and 2 are views of opposite sides of thetrammel embodying myinvention. Fig. 3 is an edge view thereof, partly sectional in line a: :10, Fig. 1. Fig. 4 is a vertical section thereof in line y y, Fig. 1.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists of a trammel having a double holder formed bya slide and an attached plate which is provided at each end with a jaw, substantially as and for the purpose hereinafter set forth. it

It also consists in a trammel having a ba provided with a groove, in combination with a holder and a slide to which said holder is as at c, forming a book, which embraces the back of the bar, and then turned inwardly into a lip, d, which enters the groove a.

To the slide B is secured a holder, 0, for a pencil and point or center, said holder being constructed of a piece of elastic metal riveted or otherwise rigidly connected at its'center withrthe slide B, the ends having grooves or 5 jaws D D for the reception of the pencil and center, it being seen that the pressure of the ends of the holder forces the pencil and center, which rest in the jaws D, against the slide and firmly holds them, permitting, however,

5 oth e raising and lowering of said pencil and center foe-the purposes of adjustment, as desired.

pencil for scribing purposes. One holder may,

have two pencils and the bar be turned on the center of another holder for describing two circles, and other uses of the instrument will suggest themselves, it being noticed that thepenoils and centers are adj ustable on the holders relative to each other. The slides are fitted to the bar or rule by being slipped over the end thereof, the-lips d entering the groove on, the bends c causing pressure of the lips against the walls of said groove. Uonsequently the slides are securely held on the bar and prevented from displacement over the top edge thereof, or shifting, when adjusted.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

is provided at each end with a jaw, substantially as andfor' the purpose set forth.

2. In a trammel, a bar provided with a groove, in combination with a holder and a slide to which said holder is attached, said slide being formed with a bend which embraces the top and back of said bar, and with an inwardly turned lip which enters said groove, substantially as set forth.

3. In a trammel, a holder'and grooved bar, in combination with a slide which embraces said bar, and is provided with a lip that enters said groove, substantially as set forth.

4'. The trammel consisting of a double holder, a slide having a bend and lip, and a grooved bar, combined and operating substantially as J OHN A. WIEDERsHEInr, W. F. KIRGHEE. 

